http://www.w3.org/ns/prov#value | - The fluorescence quencher composition of claim 1 having the structure: wherein A is a cleavable linker selected from the structures: where R??? is H, C1-C12 alkyl or C1-C12 alkoxy; L4 is selected from a bond, C1-C12 alkyldiyl, C1-C12 alkoxyldiyl, C1-C12 alkylaminodiyl, C1-C12 alkylamide
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